There are some other topics about the qt repos (just search for them . In summery you can use this repos like it is mentioned on the site
http://qt-kde.debian.net/.

But there will be maybe no smooth upgrade to 4.6.2...

slam

Post subject: RE: KDE 4.6.2? Posted: 08.04.2011, 10:40

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While the packages from the qt-kde.debian repository are of good quality, the same warnings as for any package from Debian experimental are valid. If you want a solid and supported upgrade path, wait until it hits sid, and check our upgrade warnings before actually dist-upgrading.
Greetings,
Chris